rename /cerulean -> /nix

nix/snow/nodes/default.nix

@@ -0,0 +1,62 @@
+# Copyright 2025-2026 _cry64 (Emile Clark-Boman)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+{
+  lib,
+  specialArgs,
+  ...
+}: {
+  options.nodes = let
+    inherit
+      (lib)
+      mkOption
+      types
+      ;
+  in
+    mkOption {
+      description = ''
+        Cerulean node declarations.
+      '';
+      type = types.submoduleWith {
+        inherit specialArgs;
+
+        modules = [
+          {
+            imports = [./shared.nix];
+
+            options = {
+              groups = mkOption {
+                type = types.attrs;
+                default = {};
+                example = lib.literalExpression "{ servers = { staging = {}; production = {}; }; }";
+                description = ''
+                  Hierarchical groups that nodes can be a member of.
+                '';
+              };
+
+              nodes = mkOption {
+                type = types.attrsOf (types.submoduleWith {
+                  inherit specialArgs;
+                  modules = [(import ./submodule.nix)];
+                });
+                # example = { ... }; # TODO
+                description = ''
+                  Node (host systems) declarations.
+                '';
+              };
+            };
+          }
+        ];
+      };
+    };
+}